<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/> -->
    <title>Document</title>
</head>
   <style>
        .hezi {
            background-color: red;
            width: 300px;
            height: 300px;
        }
   </style>
<body>
    <div class="hezi">你好</div>
</body>
</html>